Latch for dumb-waiter doors



May 24, 1932.

D. D. LEVY LATCH FOR DUMB WAITER DOORS Filed Sept. 7. 1929 2 Sheets-Sheet 2 Mfg/5.@

WM/@31g @MTM/mmf Patented May 24, 1932 p UNITE sr'rss PATENT OFFICE.

. DUDLEY D. LEVY, OF NEX-V YOREIQN. Y., SSIS-NOR TO DUIJLEY RESEARCH CORPORATION,

OF NEVI YGRK, N. Y., Av CORPORATION OF Nh'- W YORK LATCH FOR. DUllrIB-WAITER DOORS Application filed September 7, 1929. Serial No. 390,961.

This invention relates to a new and use- Fig. 3 is a View taken on the line 3 3 of ful latch whereby the doors for dumb-waiter Fig. 2; elevator shafts are locked when the dumbl F ig. fl: is a View showing the relation of the waiter is out of receiving positiomand are unlatching device and the latch as applied 5 unlocked by the waiter when saidwaiter is to a door sill; 55 in receiving position. Fig. 5 is a view taken on the line 5 5 of In houses that are equipped with dumb- F ig. 2 looking in the direction of the arrows; waiter service it frequently happens that ten- Fig. 6 shows portions of the respective endsl ants or their servants open the door of the a, @and relations of the door latch member 1e dumb-waiter sha-ft and throw rubbish down and door sill latch member at their notched 60 the shaft without waiting for the waiter to portions; be brought into receiving position. This vF ig. 7 is a View of a portion of a'waiter action causes muchv trouble and results in shaft showing the dumb-waiter shaft door great annoyance and it is the prime object of and Waiter about to be brought into posi- 15 my invention to provide a latch for doors Vof tion for unlatching said door and 65 dumb-waiter shafts such that a door equipped F ie. 8 is aview at right angles to that of with my 'latch cannot beopened to a suiii- Fig. cient extent for rubbish to be thrown down The same reference characters represent the shaft when the waiter is not in receiving like parts throughout the Several Views L@ position. wherever they appear.

Another object of my invention includes the Referring new t0 the drawings wherein provision of means whereby the Shaft door there is shown a form of construction suitmay be opened to a small extent and still be able for thepnrpose stated and by which I keptin latched position. From this position accomplish the Objects of my invention, In

i.; it is unlocked by the dumb-'waiter when said said drawings a dumb-waiter door is repre- 75 waiter is brought int-0 IQCGiVHg pOSitOIll sented at 10. This door is hingedly attached A further Object includes the p'OVSOIl 0f to the door frame l1 which is provided with an efficient and simple latch for dumb-waita door S511 1Q 0n the dnmnwaiter Shaft 13 Y er doors which may be readily applied and In .this Shaft there operates in' the usual 3;; which is thorc-ughly reliable and eilicient in manner the dumnwniter 14, An nnlatchng 80 operation. device l5 is provided which extends into the A still further object includes the provipath of Said dumbwiter and is Operated by SOU 0f f1 Pal? 0f Sudam? molmed parallel a strike-plate 16, on the dumb-waiter, when bars having on@ end 0f @ach 0f Sad bls PlV said waiter is brought into receiving posi otally united to the respective door and door tion. e5 sill, and means for unlatching said device by The door 1()V is normally held' in VClosed the action of the dumb-waiter being brought Position by Spring hinges 17, of the usual 111i() Tefevlg POSltOH construction, and latch 18 keeps the door Other objects will appear hereinafter and fastened. On the inner side of said door at .1l I atta-in these objects by a construction illusa Suitable distance from the Opening end oo tflted in th@ accomlanylng dra-Wings, in thereof there is provided a pivoted anchor which i 19 on which'is pivotally mounted the door Figure l is a View et a ClOOr and ClOOF Sill latch member 20. On the door sill near the for a dumb-waiter shaft having my latch hinged side of the door there is provided a device applied thereto and showing the door bracket 2l on which is pivotally mounted the in closed position; door sill latch member 22. This member Fig. Q is a view similar to that of Fig. 1 is heldin position by suitable means such as but showing the door in open position with a rivet or stud '23 engaging elongated the dumb-.waiter engaging the unlatching deslot Qiin said door sill latch member. y A

vice; spring 25 on stud 23 normally depresses the 100 door sill latch member 22 so that the same will tend to assume a flat position on its companion door latch member 20 and in so doing will press on edge l1 of the latching device 15 so as to hold the same in the path of the dumb-waiter as is indicated by dotted lines in Fig. 3.

By referring to Fig. 2 it will be apparent that the door latch member 20 is provided with a stop notch 26 near the pivotally mounted end thereof. This stop notch is so positioned that the stop pin or lug 27 near the free end of the door sill latch member 22 will engage and lock the door.

The free end of door latch member 20 is provided with a band or guide 28 which slidably engages the door sill latch member 22. Member 2() is also provided with a stop pin or lug 29 which is positioned to engage an elongated stop notch 3() on the door sill latch member 22 near its pivoted end, thereby permitting the door to be locked in partially open position. The free end of the door sill latch member 22 likewise is provided with a guide band 31 and a stop pin or lug 27 for the purpose stated above.

From this construction it will be apparent that I provide a pair of parallel bars which are slidably mounted with respect to their free end but are pivotally mounted with respect to their secured ends. This construction affords very simple but efficient means for latching the door in locked and partially closed, or fully closed positions but i; unlocking the same by the dumb-waiter when said dumb-waiter is brought into receiving position. The elongated slot 24 in the end of the door sill latch lever 22 further provides means for opening the door a little more so that it is possible to use the elevator shaft as a means of communication with a neighbor above or below.

By referring to Fig. 3 it will be seen that the unlatching device 15 is mounted on a bracket 21 by a pin or screw 40 and said unlatching device is provided with a beveled edge having an elongated nose or edge 41 to engage one side of the door sill latch member 22 thereby tilting said latch member suliiciently to release the stop pins or lugs 27 and 29. This is accomplished by the dumb-waiter being brought into receiving position. Under this condition the door may be easily opened and when the door is closed and the waiter brought out of receiving position said latch device becomes fully operative to lock the door as stated above.

It is obvious that various minor changes may suggest themselves to those versed in the art which, however, will fall fully within the scope and spirit of my invention.

That I claim, therefore, as new and useful and desire to secure by Letters Patent is 1. In a latch for dumb-Waiter doors, the

'5D combination of a pair of parallel bars mounted for engaging each other at their opposite ends, guide members on said bars for holding the same in sliding engagement, means for pivotally supporting each of said bars at one end thereof, said bars each having a notch, and means on each of said bars for engaging said notch, said means disposed to lock the door before it is completely closed.

2. In a latch for dumb-waiter doors, the combination of parallel bars, 011e of said bars being pivotally mounted on the door of said dumb-waiter shaft and the other of said bars being pivotally mounted on a part of the door frame, said bars each having a notch near its pivotally mounted portion, means for engaging each of said notches, and means for rocking one of said bars to disengage said notch engaging means.

3. A door latch device comprising bars slidably mounted, said bars each having a notch in one edge thereof, a guide band andI stop pin at one end of each of said bars, said pin engaging a notch on its companion bar, and an unlatching device engaging one of said bars for tilting the same in unlatching the door.

4. In a` latch for dumb-waiter doors, the combination of parallel bars slidably engaging each other at their opposite ends, means for pivotally supporting said bars at th-e other ends thereof, means on each of said bars for limiting the slidable movement, means for tensioning one of said bars in locking position onto the other of said bars, and a pivotally mounted unlatching device extending into the path of the dumb-waiter for rocking said bar to unlatch the same.

In testimony whereof I have hereunto set my hand on this 3rd day of September, A.. D.

DUDLEY LEVY. 

